body {
    background: #333;
    color: white;
}

#app {
    padding: 80px;
    margin: 0 auto;
    display: flex;
    width: 50vw;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

#box {
    text-align: center;
}

input {
    line-height: 5vh;
    font-size: 2rem;
}

button {
    padding: 5px 10px;
}